I define UNIX as 30 definitions of regular expressions living under one roof.
From an operating system research point of view, Unix is if not dead certainly old stuff, and it's clear that people should be looking beyond it.
I changed the Linux copyright license to be the GPL some time in the first half of 1992. Mostly because I had hated the lack of a cheaply and easily available UNIX when I had looked for one a year before.
If Unix could present the same face, the same capabilities, on machines of many different types, it could serve as a common software environment for all of them.
The Open Source theorem says that if you give away source code, innovation will occur. Certainly, Unix was done this way... However, the corollary states that the innovation will occur elsewhere. No matter how many people you hire. So the only way to get close to the state of the art is to give the people who are going to be doing the innovative things the means to do it. That's why we had built-in source code with Unix. Open source is tapping the energy that's out there.
So I would not be surprised if the globbing libraries, for example, will do NFD-mangling in order to glob "correctly", so even programs ported from real Unix might end up getting pathnames subtly changed into NFD as part of some hot library-on-library action with UTF hackery inside.
Obviously, the person who had most influence on my career was Ken Thompson. Unix was basically his, likewise C's predecessor, likewise much of the basis of Plan 9 (though Rob Pike was the real force in getting it together). And in the meantime Ken created the first computer chess master and pretty much rewrote the book on chess endgames. He is quite a phenomenon.
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